Air quit working. Replaced DCCV. Still hot air. Pulled Climate Control Module, CCM, to check pins for continuity.

Please note, followed same approach 3 years ago, successfully repairing system. At that time there was evidence of burnt traces on the back side of circuit board, which I soldered jumper wires to repair.

This time, I see evidence of burnt trace on front side of card, (it is possible that burnt trace existed the previous time, I do not recall exactly.) The burnt trace is in the area of what I am calling and have pictured, as pin7. I cannot determine what pad the path from Pin 7 leads to on the front side of the card.

What pad does pin 7 path lead to? Can anyone help me?

Thanks, Joe

 

If your burning traces that means the DCCV solenoids are drawing too much current (again!). When you did the CCM repair ( You must not have navigation?) did you install the protection diodes?

If not you might look at Jaguar Climate control for what should be done.

Repair & Upgrade - JaguarClimateControl.com

I would either replace the DCCV again or do some troubleshooting to find the excessive current draw.
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Thanks for the reply, but I think you read my post too fast. The DCCV was just replaced, but not before it went bad, and thus probably did damage the CCM as I am still getting hot air. Yes, I am familiar with JaguarClimateControl.com. If you can't do it yourself, they are a fine choice, and I may yet still use their service. What I am looking for is a schematic or answer to the question of where the pad is for what I am calling pin #7. And/or if seeing the photo of my circuit board will provide guidence toward a solution. Thanks again, can you provide any additional info about pin 7?

 

You said you repaired it 3 years ago? Did you replace the DCCV again?

We don't have access to the electrical system to that level of detail.

A factory tech might but I doubt it. There is no repair at that level it's just decide if the module is bad or not and then replace it.
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Yes, to be clear, the DCCV has been replaced twice. Most recently 3 days ago. The CCM has been pulled twice. Most recently 3 days ago.

The CCM has been fixed previously by soldering jumpers to "rewire" burnt traces, but no, a fuse or diode was not added. So, when the DCCV went bad again, the CCM was probably damaged again.

In trying to identify the recent damage, I am trying to identify which pad certain pins have a path to. Someone who has repaired their CCM circuit board has probably had to figure this out, and they may now be able to recall that information to help.

Thanks.

 

you can physically 'follow' the pins and circuits along both sides of the board,

you may need a magnifying glass,

combined with a voltmeter or continuity tester, you can trace each circuit and figure out what is burnt out and where,

in the pic you posted, there is damage visible in the circuit near R86 on the board,

 

Thanks for the reply, I guess IT IS me that is having trouble communicating. Having once before repaired the CCM circuit board, I am aware of following the path from a pin to a pad on the board using a continuity tester.

My trouble is that I can't find a pad on the top of the card that is connected to the 7th pin on the top row, starting from the right. There are several paths that seemingly touch that pin, but the pads at the end of those paths are all testing continuity to adjacent pins. I can't find one pad that has continuity with pin 7.

 

Joe;
You are at a level of detail the factory just does not provide. I am sure Jaguar Climate Control will know but that's their business so it's not likely they would give that out.

Maybe another member can take a picture of the circuit board to help you out? If not you might look for a used CCM.
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There are a few pics already posted but may not show so much detail. Also, there are slightly different versions of the board so be wary.